PileUpHashHelper.h

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/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef PILEUPTOOLS_PILEUPHASHHELPER_H
#define PILEUPTOOLS_PILEUPHASHHELPER_H
 
#include <sstream>
 
#include <uuid/uuid.h>
 
#include <xAODEventInfo/EventInfo.h>
 
class PileUpHashHelper
{
public:
  PileUpHashHelper() {}
 
  void addToHashSource(const std::string &string);
 
  void addToHashSource(const xAOD::EventInfo *eventInfo);
 
  void clearHashSource();
 
  std::string hashSource() const { return m_stream.str(); }
 
  void calculateHash(uuid_t &hash) const;
 
  static xAOD::EventInfo::PileUpMixtureID uuidToPileUpMixtureId(const uuid_t &hash);
 
  static void pileUpMixtureIdToUuid(const xAOD::EventInfo::PileUpMixtureID &mixture,
                                    uuid_t &hash);
 
  static const uint16_t PILEUP_SIZE_BYTES = 8;
 
private:
  std::stringstream m_stream;
};
 
#endif // PILEUPTOOLS_PILEUPHASHHELPER_H